The ozone layer and automotive refrigerant recovery and recycling have been grabbing a lot of headlines for the past couple of years. While most of our attention during this period has been directed toward EPA rules and regulations, technician certification requirements, and new recover and recycling equipment purchases, we may have given R-134a the back seat. You remember R-134s, don’t you? R-134a is the refrigerant that will replace R-12 in all new automotive air conditioning systems by the year 1995.